<!-- 商品功能 -->
  <template>
    <div>
      <!-- 面包屑导航区 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>
      <!-- 卡片视图 -->
      <el-card>
        <!-- 提示 -->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
        <!-- 步骤条 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>
  
        <!-- Tab栏 -->
        <el-form
          :model="addForm"
          :rules="addFormRules"
          ref="addFormRef"
          label-width="100px"
          label-position="top"
        >
          <el-tabs
            v-model="activeIndex"
            :tab-position="'left'"
            :before-leave="beforeTabLeave"
            @tab-click="tabClicked"
          >
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader
                  v-model="addForm.goods_cat"
                  :options="cateList"
                  :props="cascaderProps"
                  @change="handleChange"
                ></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <!-- 渲染表单的Item项 -->
              <el-form-item
                v-for="item in manyTableData
  
              "
                :key="item.attr_id"
                :label="item.attr_name"
              >
                <!-- 复选框组 -->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <!-- action: 图片上传的API接口地址 -->
              <el-upload
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                :headers="headerObj"
                list-type="picture"
                :on-success="handleSuccess"
              >
                <el-button size="small" type="primary">点击上传</el-button>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <!-- 富文本编辑器 -->
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <!-- 添加商品 -->
              <el-button type="primary" class="btnAdd" @click="addGoods">添加商品</el-button>
            </el-tab-pane>
          </el-tabs>
        </el-form>
      </el-card>
      <el-dialog title="图片预览" :visible.sync="previewDialogVisible" width="50%">
        <img :src="picPreviewPath" alt="" class="previewImg">
      </el-dialog>
    </div>
  </template>
  
  <script>
  import _ from 'lodash'
  export default {
    data () {
      return {
        // 步骤条默认激活 与左侧Tab联动
        activeIndex: '0',
        // 添加商品的表单对象
        addForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          // 商品所属分类数组
          goods_cat: [],
          // 图片的数组
          pics: [],
          // 商品详情描述
          goods_introduce: '',
          attrs: []
        },
        addFormRules: {
          goods_name: [
            { required: true, message: '请输入商品名称', trigger: 'blur' }
          ],
          goods_price: [
            { required: true, message: '请输入商品价格', trigger: 'blur' }
          ],
          goods_weight: [
            { required: true, message: '请输入商品重量', trigger: 'blur' }
          ],
          goods_number: [
            { required: true, message: '请输入商品数量', trigger: 'blur' }
          ],
          goods_cat: [
            { required: true, message: '请选择商品分类', trigger: 'blur' }
          ]
        },
        // 商品列表
        cateList: [],
        // 级联选择器配置
        cascaderProps: {
          expandTrigger: 'hover',
          label: 'cat_name',
          value: 'cat_id',
          children: 'children'
        },
        // 动态参数列表数据
        manyTableData: [],
        // 静态属性列表数据
        onlyTableData: [],
        // 图片上传地址
        uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
        // 图片上传组件的请求对象
        headerObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        picPreviewPath: '',
        // 图片预览对话框
        previewDialogVisible: false
      }
    },
    created () {
      this.getCateList()
    },
    computed: {
      getCateId () {
        if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      }
    },
    methods: {
      // 获取商品分类数据列表
      async getCateList () {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品列表失败！')
        }
        this.cateList = res.data
      },
      // 级联选择器选中项变化时出发
      handleChange () {
        if (this.addForm.goods_cat.length !== 3) {
          this.addForm.goods_cat = []
        }
      },
      beforeTabLeave (activeName, odlActiveName) {
        // 未选中商品分类阻止Tab标签跳转
        if (odlActiveName === '0' && this.addForm.goods_cat.length !== 3) {
          this.$message.error('请先选择商品分类')
          return false
        }
      },
      // Tab标签被选中时触发
      async tabClicked () {
        // 访问动态参数面板
        if (this.activeIndex === '1') {
          const { data: res } = await this.$http.get(
            `categories/${this.getCateId}/attributes`,
            {
              params: { sel: 'many' }
            }
          )
          if (res.meta.status !== 200) {
            return this.$message.error('获取动态参数列表失败！')
          }
          res.data.forEach(item => {
            item.attr_vals =
              item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          })
          this.manyTableData = res.data
        } else if (this.activeIndex === '2') {
          const { data: res } = await this.$http.get(
            `categories/${this.getCateId}/attributes`,
            {
              params: { sel: 'only' }
            }
          )
          if (res.meta.status !== 200) {
            return this.$message.error('获取动态参数列表失败！')
          }
          this.onlyTableData = res.data
        }
      },
      // 处理图片预览
      handlePreview (file) {
        this.picPreviewPath = file.response.data.url
        this.previewDialogVisible = true
      },
      // 处理移除图片的操作
      handleRemove (file) {
        // 1.获取将要删除图片的临时路径
        const filePath = file.response.data.tmp_path
        // 2.从pics数组中，找到图片对应的索引值
        const i = this.addForm.pics.findIndex(x => x.pic === filePath)
        // 3.调用splice方法，移除图片信息
        this.addForm.splice(i, 1)
      },
      // 监听图片上传成功事件
      handleSuccess (response) {
        // 1.拼接得到一个图片信息对象 临时路径
        const picInfo = { pic: response.data.tmp_path }
        // 2.将图片信息对象，push到pics数组中
        this.addForm.pics.push(picInfo)
      },
      // 添加商品
      addGoods () {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return this.$message.error('请填写必要的表单项！')
          // 发送请求前：需对提交的表单进行处理goods_cat attrs
          // this.addForm.goods_cat = this.addForm.goods_cat.join(',')
          // 以上写法不对：级联选择器绑定的对象goods_cat要求是数组对象
          // 解决办法: 包：lodash 方法（深拷贝）：cloneDeep(boj)
  
          // 将this.addForm进行深拷贝
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
  
          // 处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          // 发起请求添加商品
          // 商品名称必须是唯一的
          const { data: res } = await this.$http.post('goods', form)
          if (res.meta.status !== 201) return this.$message.error('添加商品失败！')
          this.$message.success('添加商品成功!')
          this.$router.push('/goods')
        })
      }
    }
  }
  </script>
  
  <style lang='less' scoped>
  .el-checkbox {
    margin: 0 8px 0 0 !important;
  }
  .previewImg{
    width: 100%;
  }
  .btnAdd{
    margin-top: 15px
  }
  </style>
